package mapreduce;
import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
public class OneSort {
    public static class Map extends Mapper < Object, Text, IntWritable, Text > {
        private static Text goods = new Text();
        private static IntWritable num = new IntWritable();
        public void map(Object key, Text value, Context context) throws IOException,
        InterruptedException {
            String line = value.toString();
            String arr[] = line.split(" ");
            num.set(Integer.parseInt(arr[1]));
            goods.set(arr[0]);
            context.write(num, goods);
        }
    }
    public static class Reduce extends Reducer < IntWritable, Text, IntWritable, Text > {
        private static IntWritable result = new IntWritable();
        public void reduce(IntWritable key, Iterable < Text > values, Context context) throws IOException,
        InterruptedException {
            for (Text val: values) {
                context.write(key, val);
            }
        }
    }
    public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
        Configuration conf = new Configuration();
        Job job = new Job(conf, "OneSort");
        job.setJarByClass(OneSort.class);
        job.setMapperClass(Map.class);
        job.setReducerClass(Reduce.class);
        job.setOutputKeyClass(IntWritable.class);
        job.setOutputValueClass(Text.class);
        job.setInputFormatClass(TextInputFormat.class);
        job.setOutputFormatClass(TextOutputFormat.class);
        Path in = new Path("hdfs://localhost:9000/mymapreduce3/in/goods_visit1");
        Path out = new Path("hdfs://localhost:9000/mymapreduce3/out");
        FileInputFormat.addInputPath(job, in );
        FileOutputFormat.setOutputPath(job, out);
        System.exit(job.waitForCompletion(true) ? 0 : 1);

    }
}